Ciara Mageean ran a personal best in the 1500m final at the Athletics World Championships in Doha, finishing in 10th place in a time of 4:00.15.
The Down native more than held her own in a final which was won by Sifan Hassan of the Netherlands, who clocked a championship-record time of 3:51.36.
Mageean came agonisingly close to breaking the four-minute mark and can take huge encouragement from her brilliant performance in a stellar field.
It was a second gold medal for Hassan at this championships who has already clinched the 10,000m gold medal at these championships.
Her triumph should be a good news story having arrived in the Netherlands as a teenage refugee, but there is a cloud hanging over all of her achievements in the form of disgraced coach Alberto Salazar, who has been handed a four-year doping ban.
"I'm absolutely over the moon," she told RTÉ Sport after the race.
"I said I'd come in and throw the kitchen sink at it. I did, that pace went out hard.
"I know there's girls out there who have ran 3.56 - I'm just not there yet. But whenever the pace went, I said 'Ciara don't get disheartened. You're at the back of the field but that's OK. I came into this competition ranked probably 14th or 16th and came 10th in the world. That's not a bad place to be for a wee girl from Portaferry.
"I'm delighted, it shows me that I've a lot of work to do to be where I want to be. First place is my goal in life and I'm gonna work super hard over the next while to close that gap."
She added: "Coming down that last home straight, I was hurting. And it's very hard whenever you know you're at the back of the field. Sometimes you're mind can go.
"I did everything I could to catch the Ugandan girl and listen, 10th in the world - I put the swan on a lead and I tried my best to keep hold of it!"
Remarking on how close she came to breaking the four-minute mark, Mageean said:
"I know it's there. I ran out and ran 4.01 in a split of a mile over in Monaco and it just showed me where I can be. Give me another race and I could run sub-four but it's October. I'm ready for a break, I'm gonna fly into Dublin, watch the girls play football in Tallaght. I can't wait! I'll see my boyfriend, see my family and then the hard work starts again.
"I want to say a huge thank you to everybody out in the crowd. I saw the tricolours and the Down jerseys. It's an absolute credit and I'm so grateful for that. I see the messages coming through and it really means so much, it gives you a lift.
"I think everyone can see I'm a different athlete now, it's clear to see how much I'm enjoying it. I'm grateful to be able to wear this vest, to be able to represent my country, my hometown, my county and my team in Manchester. Fantastic season!"